<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>04_弹性布局入门</title>
    <style>
      .container{
        width: 500px;
        background-color: lightgreen;
        display: flex;
        flex-direction: row;  /* 横向排列 */
        flex-direction: column;
        flex-direction: row-reverse;
        flex-direction: column-reverse;

      }
      .item{
        width: 100px;
        height: 100px;
        background-color: lightpink;
        border:3px solid deeppink;
        font-size: 45px;
      }
    </style>
</head>
<body>
<div class="container">
  <div class="item">1</div>
  <div class="item">2</div>
  <div class="item">3</div>
  <div class="item">4</div>
  <div class="item">5</div>
  <div class="item">6</div>
  <div class="item">7</div>
</div>
</body>
</html>